When Oliver tells Barry he still has a lot to learn, Barry sets out to prove him wrong by attempting to stop Bivolo alone.

However, when Bivolo infects Barry and sets him on a rage rampage, everyone is in danger, and the only one who can stop him is the Arrow.

Meanwhile, Iris (Candice Patton) is furious when Eddie (Rick Cosnett) tries to get a task force to stop The Flash, Joe and Dr.

Wells (Tom Cavanagh) agree the Arrow is a bad influence on Barry, and Caitlin and Cisco deal with a new team in S.T.A.R.

Labs Executive Producer Andrew Kreisberg told TV Guide that fans might want to pay more attention to “The Flash” if they want to be ready for the crossover special.

Kreisberg explained to TV Guide , “We discover something about Oliver (Stephen Amell) which is probably one of the biggest secrets we’ve ever revealed on the show – and it happens on ‘The Flash’.” The shows have already proven to be interwover, with Barry visiting “The Arrow” in season 2.

In the episode 4 , ” Gone Rogue ,” when Barry Allen got a visit from Felicity Smoak who came to see the new superhero’s new powers.

The two even went out on a date and shared a kiss after Felicity helped Barry stop Captain Cold.

“The Flash” airs on Tuesdays at 8 p.m.

on CW, but again missed this week, so episode 5 will come out next Tuesday.